Oak Lawn Farm Dairy Barn is a historic Gothic-arch barn building northeast of Whitewater, Kansas, United States. It was built in a Late Gothic Revival style in 1926 and was added to the National Register of Historic Places in 2005. It was deemed "an excellent example of an early twentieth century, bent-rafter gothic roof style barn."

It is an L-shaped wooden barn with a rounded roof, and is about 80 by 60 feet (24 m × 18 m) in plan.